General shape: Elliptical with rounded forward end and truncated tail.
Material: Sheet steel.
Dimensions:

Over-all length: 29.5 inches.
Maximum diameter: 12.125 inches (across rib).
Wall thickness: 0.109 inch.
Diameter at Tail, External: 8.938 inches.
Diameter at Tail, Internal: 8.625 inches.
Diameter at Nose: 4.563 inches.

Weights:

Empty: 49 pounds 12 ounces.
Weight of Filling: 98 pounds 6 ounces.
Filling: 60/40 amatol.

Stamped on Nose of Head: 23.
Stenciled in White Approximatelly 4 Inches Below Fuze: 30 cm WK 42 Spr.
Stenciled on Rear Center: 13 Jg 29 9 42.
Stamped on Lower End: 42, CKI.

Nature: Point detonating instantaneous nose fuze Wgr.Z. 50+.
Weight with Adapter: 1 pound.
Action: The fuze is armed in two steps: by withdrawing a safety pin before firing and by centrifugal action after firing.

DESCRIPTION. This projectile is similar in design to the 28- and 32-cm rockets, being spin-stabilized and consisting of a forward warhead to the rear of which is attached a rocket motor of smaller diameter. (See fig. 217.)

Warhead. The warhead is constructed of two sections of sheet steel, a nose piece and a tail, the four sections being joined together by circumferential welds. A single rib around the center of the projectile serves to reduce friction against the side of the launcher.

The nose piece is threaded to receive a nose fuze, Wgr.Z. 50 and a gaine, and the tail internally threaded to screw onto the forward end of the rocket motor. The H.E. filling consists of 96 pounds of amatol.

Rocket Motor. The rocket motor is of conventional design and consists basically of a cy-lindrical body and a vase plug incorporating the venturi and igniter assemblies.

The body is machined internally and externally and is closed at the forward end, where it is threaded to screw on the tail of the warhead. This end section is not flat but is slight-ly concave internally to permit a more even distribution of pres-sure. The rear end of the body is threaded internally to receive the base plug which has 18 offset venturi drillings and a central drilling to take an electrical igniter.

The propellant, which consists of seven monoperforated sticks, is located by two grids, one at each end of the motor body. A celluloid tube containing a quick-match train and plugged at each end by a gunpowder pellet, is located in the drilling in the central stick and transmits the flash from the igniter to the ignition charge at the forward end of the motor.

Figure 217 – 30-cm H.E. Rocket